矩量法分析平面等角螺旋天线的脉冲辐射特性  

Pulse Radiation Characteristic of Planar Equiangular Spiral Antennas Based on the Method of Moment

作　　者：李长勇[1,2] 陈于平[3] 刘郁林[1] 杨士中[2] 

机构地区：[1]中国人民解放军重庆通信学院,重庆400035 [2]重庆大学通信工程学院,重庆400030 [3]中国人民解放军通信指挥学院,武汉430010

出　　处：《微波学报》2009年第1期13-16,29,共5页Journal of Microwaves

基　　金：国家自然科学基金(60672157);重庆大学研究生科技创新基金(200801A1A0150274)

摘　　要：对等角平面螺旋天线进行RWG边元建模,利用矩量法求天线表面电流,并进一步得到天线的输入阻抗、天线转移函数和脉冲辐射波形。研究显示:在工作频带内,天线的输入阻抗值约为自互补结构天线的输入阻抗理论值188.5Ω(满足巴比涅-布克原理[1]),即空间本征阻抗之一半,在超宽频带内,天线的转移函数具有平坦的幅频特性和较好的线性相频特性,用作脉冲辐射天线时,辐射电场波形具有高斯二次微分特性。Planar equiangular spiral antennas （PESA） are modeled by the RGW edge element models. The surface current of the antenna is solved by the Method of Moment （ MoM ）. The input impedance, transfer function and radiated pulse waveform of the antenna are presented. The results show that, in the interest band, its input impedance is in good a- greement with the theoretical value of that of Self-Compensated antennas （as defined by Babinet-booker＇ principle ）. Its transfer function has a fiat amplitude response and a linear phase response over very wide band. PESA can be used as a ultra- wide band （UWB） pulse antenna. Radiating electric field waveform is similar to that of second derivative Gaussian pulse.

关 键 词：RWG基函数 平面等角螺旋天线 高斯微分脉冲 输入阻抗 天线转移函数 辐射电场 

分 类 号：TN823.31[电子电信—信息与通信工程] TN820